Experiencing severe weakness alongside a decline in sexual stamina is common and often reversible. First, it is important to address the underlying cause of your weakness rather than just treating the sexual symptoms. I recommend consulting a healthcare provider to check for nutritional deficiencies, hormonal imbalances, or cardiovascular health. For energy and stamina, a daily multivitamin, Coenzyme Q10, or L-arginine supplements can support blood flow and cellular energy with minimal side effects. Avoid starting specific medications like sildenafil or tadalafil without a doctor's evaluation, as severe weakness needs to be properly diagnosed first. Focus on balanced nutrition, hydration, and adequate rest.